On April 27 at midnight KST, the pre-debut girl group LOONA released a mesmerizing teaser titled “youth youth by young” that introduces their new unit yyxy, which consists of members Yves, Chuu, Go Won, and Olivia Hye.

LOONA says the unit is “composed of four girls who denied Eden, talking about the ego of the youth. Being in love, hurt, broken, but still stepping forward, they capture moments of youth to complete an ego. They declare neanthropic chromosome ‘yyxy,’ different to xx or xy chromosomes.”

LOONA is a pre-debut group with 12 members, who have been releasing music videos both individually and as units since 2016. The four members of yyxy are the most recent members to be introduced to fans, and you can check out their solo MVs here: Yves, Chuu, Go Won, and Olivia Hye.